Question

Hộ mik với a, camonn các bnn nhìu, Ai nhanh, đúng mik tick nha. Tks các bn nhieuuuu

Answer 1

a) [461 + (−78) + 40] + (−461)

= [461 + (−461)] + [(−78) + 40]

= 0 + (−38)

= −38

b) [53 + (−76)] − [−76 − (−53)]

= [−23] − [−23]

= −23 + 23

= 0

c) −564 + [(−724) + 564 + 224]

= [−564 + 564] + [(−724) + 224]

= 0 + (−500)

= −500

d) −87 + (−12) − (−487) + 512

= −87 − 12 + 487 + 512

= (−99) + 999= 900

e) 942 − 2367 + 2563 − 1942

= (942 − 1942) + (2563 − 2367)

= (−1000) + 196

= −804

f) 17 + (−20) + 23 + (−26) + ... + 53 + (−56)

= [17 + (−20)] + [23 + (−26)] + [29 + (−32)] + [35 + (−38)] + [41 + (−44)] + [47 + (−50)] + [53 + (−56)]

= (−3) + (−3) + (−3) + (−3) + (−3) + (−3) + (−3)

= 7 × (−3)= −21